Accession Number : ADA335739

Title :   Solids-NMR Apparatus for Materials Characterization

Descriptive Note : Final rept. 15 Sep 96-14 /Sep 97

Corporate Author : MISSOURI UNIV-KANSAS CITY DEPT OF CHEMISTRY

Personal Author(s) : Sandreczki, T. C.

PDF Url : ADA335739

Report Date : 14 DEC 1997

Pagination or Media Count : 9

Abstract : Acquire solids-nuclear magnetic resonance (solids-NMR) capability to enable characterization of polymers and other solid-state materials of relevance to DoD. Instrumentation Acquired: A solids-NMR accessory was acquired for an existing Bruker AC250 (1H resonance at 250 MHz) liquids-NMR spectrometer. The acquired equipment included: (a) 35 W buffer amplifier, (b) 120 W radio frequency (RF) amplifier for 1H decoupling, (c) 300 W broadband rf amplifier for non-1H nuclei, and (d) 7 mm-sample-diameter (0.300 ml sample volume) cross polarization/magic-angle spinning (CP/MAS) probe with pneumatic control unit. The apparatus was installed and tested by specialists from Bruker Instruments, Billerica, MA. Research Supported by Instrumentation: The first solid sample investigated using the newly acquired apparatus was the monomer 1,5,7,11-tetraoxospiro5,5undecane, commonly called spiroorthocarbonate(0,0). This is an example of a monomer that polymerize without reduction in volume. Research to be Supported by Instrumentation: Solids-NMR will be used to help determine the structures of organic polymers and inorganic solid-state materials of relevance to DoD. The polymers include ladder- and semi-ladder-shaped highly conjugated polymers, and their monomers, and polyurethane coating materials. The inorganic solids include catalytic zeolites and ferrierites. Relevant nuclei are: 27 Al (65 MHz), 13C (63 MHz), 29Si (50 MHz) and 15N (25 MHz).

Descriptors :   *NUCLEAR MAGNETIC RESONANCE, *COMPOSITE MATERIALS, *SOLIDS, BUFFERS, CONTROL SYSTEMS, MATERIALS, POLYMERS, STRUCTURES, COATINGS, ORGANIC COMPOUNDS, INSTRUMENTATION, MONOMERS, CATALYSIS, SOLID STATE CHEMISTRY, SOLID STATE ELECTRONICS, AMPLIFIERS, ION EXCHANGE, NUCLEI, INORGANIC MATERIALS, PNEUMATIC EQUIPMENT.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE